UMFI-22-GEN2 - Measurement Radiant - Free user manual and instructions

Product Type	Digital Multimeter
Brand	Radiant
Model	UMFI-22-GEN2
Category	Measurement
Dimensions	Approx. 150 x 80 x 30 mm
Weight	Approx. 250 g (with battery)
Power Supply	1 x 9V battery (6F22, NEDA 1604)
Display	LCD, 3 1/2 digits, 2000 counts
DC Voltage Range	200 mV, 2V, 20V, 200V, 600V
AC Voltage Range	200 mV, 2V, 20V, 200V, 600V
DC Current Range	200 µA, 2 mA, 20 mA, 200 mA, 10 A
Resistance Range	200 Ω, 2 kΩ, 20 kΩ, 200 kΩ, 2 MΩ, 20 MΩ
Other Functions	Diode test, continuity buzzer, transistor test
Safety Rating	CAT II 600V
Operating Temperature	0°C to 40°C (32°F to 104°F)
Storage Temperature	-10°C to 50°C (14°F to 122°F)
Accessories Included	Test leads, battery, user manual
Maintenance	Clean with a dry cloth; replace battery when low
Spare Parts Availability	Test leads and battery are commonly available
Reparability	Basic user serviceable: battery replacement; otherwise contact service center

Frequently Asked Questions - UMFI-22-GEN2 Radiant

How to measure DC voltage with the Radiant UMFI-22-GEN2?

Set the rotary switch to the DC voltage position (V with straight line). Connect the black test lead to COM and red to VΩmA. Touch probes to the circuit points. Read the value on the LCD.

What does the 'OL' reading mean on the display?

'OL' indicates overload, meaning the measured value exceeds the selected range. Switch to a higher range to get a valid reading.

How to replace the battery in the UMFI-22-GEN2?

Turn off the meter and remove the test leads. Unscrew the battery compartment cover on the back. Replace the 9V battery (6F22) with a new one, ensuring correct polarity. Close the cover and tighten the screw.

Can I measure AC current with this multimeter?

Yes, but only for AC current up to 10A. Set the rotary switch to the AC current range (A~). For currents above 200mA, use the 10A jack (red lead); for lower currents, use the VΩmA jack.

What is the purpose of the 'HOLD' button?

The 'HOLD' button freezes the current reading on the display. Press it again to release the hold. Useful for recording measurements in difficult positions.

How to test continuity with the UMFI-22-GEN2?

Set the rotary switch to the continuity/diode position (usually indicated by a speaker symbol). Connect the test leads to COM and VΩmA. Touch the probes together: the meter should beep continuously. Then touch the two points of the circuit. A beep indicates a closed circuit (low resistance).

Is the Radiant UMFI-22-GEN2 safe for mains voltage measurement?

It is rated CAT II 600V, meaning it is safe for measurements on single-phase household outlets and circuits up to 600V AC/DC. However, do not use it on high-energy circuits like industrial three-phase systems.

What should I do if the meter shows inaccurate readings?

First, check the battery voltage; a weak battery can cause errors. Ensure test leads are properly inserted. If the issue persists, calibrate the meter by zeroing the resistance (short probes) or consult the manual for trimmer adjustment. For professional calibration, contact an authorized service center.

Can I measure temperature with this device?

No, the UMFI-22-GEN2 does not have a temperature measurement function. It can only measure voltage, current, resistance, diode, continuity, and possibly transistor gain.

How do I store the multimeter properly?

Store in a cool, dry place away from direct sunlight and moisture. Remove the battery if not used for an extended period to prevent leakage. Keep the test leads organized and avoid wrapping them tightly around the meter.

USER MANUAL UMFI-22-GEN2 Radiant

Airspeed screen: Indicated Airspeed / True Airspeed / Digital Altitude / Analog (Dial) Representation of Airspeed / Digital VSI / Settable Kollsman / Outside Air Temperature / System Voltage (8 points of data on one screen)

Altimeter Focus: Digital Altitude / Analog (Dial) Representation of altitude / Density Altitude / Outside Air Temperature / Digital VSI / Settable Kollsman

Technical Specifications / Operation

Last updated July 29, 2024

RADIANT Technology's GEN2 instrument lineup includes a Universal Multi-Function Instrument (UMFI) with rich airspeed and altimeter functions on ONE SCREEN. The “Presentation Screen” contains all primary functions. A secondary “Altimeter Focus” provides a smooth analog representation of altitude and a bonus density altitude calculation. Access the “Altimeter Focus” by pushing any button for 5 seconds.

100 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 360 370 380 390 400 410 420 430 440 450 460 470 480 490 500 510 520 530 540 550 560 570 580 590 600 610 620 630 640 650 660 670 680 690 700 710 720 730 740 750 760 770 780 790 800 810 820 830 840 850 860 870 880 890 900 910 920 930 940 950 960 970 980 990 1000

Presentation Screen

25.00 RMB FLT 12 TEMP 240 00 031 128.1 RMB/FLT 299.2 OFF DKN

Altimeter Focus

GENERAL TECHNICAL SPECIFICATIONS:

Sunlight readable, with extremely high contrast.

- User selectable for airspeed 100 or 200 range (airspeed units).

- User selectable for airspeed knots or MPH (airspeed units).

- User selectable for Celsius or Fahrenheit (outside air temperature).

- Airspeed: Indicated Airspeed / True Airspeed / Digital Altitude / Analog (Dial) Representation of Airspeed / Digital VSI / Settable Kollsman / Outside Air Temperature / System Voltage (8 points of data on one screen).

- Altimeter Focus: Digital Altitude / Analog (Dial) Representation of altitude / Density Altitude / Outside Air Temperature / Digital VSI / Settable Kollsman

- Dimmable (uses external potentiometer, not included).

- Designed to fit 2 14 " instrument rectangular cutout with 2 bolts (included), or 3 1/8" standard panel cutout using included adapter ring. Will also fit into standard 2 14 " round instrument cutout with very slight clipping of the left side of the screen.

- Power Source: +6.5 to +14 volts, approximately 0.125 ampere. Functions with reduced screen brightness down to 4.5 volts.

- Case is black nylon with chopped carbon fiber, 3D printed.

- Includes external temperature sensor for OAT with included 2 meter harness (\~80 inch).

200 150 140 00 UP DOWN 72 TEMP Fdd 120 UFS 00 TRUE AURSSED 00 UFSI 128.1 ALTITUDE 299.2 INCE HS

Airspeed Indicator in 3 1/8 cutout packaging showing digital / analog dial representation; OAT, system voltage; True airspeed; VSI; altitude; settable Kollsman window.

INSTALLATION:

• Install instrument in 2 14 " panel left side rectangular cutout using two supplied nuts / bolts. 3 1/8" installation in standard panel cutout using four supplied nuts / bolts. If the 2 14 " left side rectangular cutout is not made, a small portion of the dial indicator on the left side may be slightly clipped from viewing.
• Attach black wire (ground) to ship ground.
• Attach red wire (power) to ship power, +6.5 to +14 volts. Do not exceed 14 volts. Use appropriate fuse (1 amp) and avionics master switch for operation.
• For control of dimming, optionally wire the yellow wire to a 10K potentiometer, with ONLY +5 volts / ground.) +5 is available via individual red wire from instrument. Leave the yellow wire unconnected for continuous full bright operation. If you send us an email request within one year of purchase, we will mail you a potentiometer without charge to any US / Canadian address.
  • The ASI dongle is attached via the 7 pin connector.
• The back of all units has a static port for the altimeter. It may be attached to an adapter tube (included) into your aircraft's static pressure port, or left unconnected.
• The ASI dongle has a “P” (pitot) and a “S” (static) marking. Using the included adapter tubes, attach these to your pitot tube and your static pressure port.
• Attach the temperature probe using the included 2 meter cable to any shaded spot on your airplane, such as the underside of a wing.

SETUP:

• You only need to set up the instrument once in its lifetime. If you wish to skip setup, the factory settings are already set to Fahrenheit / 200 / Knots / 29.92 / 50 / 70 / 90 on airspeeds. The unit will operate out of the box.
• To enter Setup mode, before turning on power, push either button in and hold it in. Then turn on the power. Keep the button pushed in throughout! After 10 seconds, the SETUP screen will appear. You can now release the button. The setup screen looks like the following:

C F FAH MPH KTS RANGE ALT ERROR GREEN YELLOW RED

• Briefly touch either button, and the Celsius / Fahrenheit indicator will switch back and forth. When you have made the appropriate selection, hold either button for five seconds, and the next data line will appear.
• You may now select MPH or Knots in a similar manner. Hold either button for five seconds, and the range will appear.
  • In a similar manner, select 100 or 200.

- In a similar manner, you may change the 29.92 error value. Increasing will result in 10 feet of additional altitude; decreasing works in the other direction. THIS IS THE ERROR CALIBRATION VALUE. It needs to be changed only in response to an error in the altitude. You shouldn't have to do this more than once per year. If you don't understand this, just leave it at 29.92. When you have selected your appropriate value, hold either button for five seconds to advance to the next screen.

- Set your Green start speed, yellow start speed, and redline values. When all is done, the setup screen will look like this:

- After you've set the redline, hold either button for more than five seconds, and the unit will begin normal operation.

OPERATION:

Turn the unit on using an external switch.

- The brightness may be adjusted using the optional external potentiometer.

• The following picture shows the main screen:

200 180 160 140 120 100 UP DOWN 72 TEMP FAH 120 VOLTS 00 TRUE AIRSPEED 00 VSI 128.1 ALTITUDE 2992 INCA HG

√ The round dial shows current indicated airspeed in dial format.
√ The boxed ASI shows digital indicated airspeed in digital format.
√ The temperature box shows OAT.
√ The VOLTS box shows current system voltage.
√ The true airspeed box shows the result of the air computer calculation, which incorporates altitude and temperature to produce TAS.
√ The VSI shows current vertical speed.
√ Altitude shows current digital altitude, as adjusted by the Kollsman window.

√ You set the Kollsman window using the UP and DOWN buttons. This functionality is identical to any aircraft altimeter. Get the correct pressure value from your nearest weather reporting station. Set the Kollsman value by briefly pressing either button. If you press both UP and DOWN buttons simultaneously, the Kollsman value will reset to 29.92. The altitude will be calculated and shown as both a digital and a dial value.

- By pressing either button for more than 3 seconds continuously, the unit will advance to a secondary, ‘Altitude Focus’ screen. It adds a Density Altitude calculation and a dial representation of the altitude.

2500 DEN ALT 12 TEMP FAH 00 USI 128.1 ALTITUDE 2992 INCH HG UP DOWN

- By pressing either button for more than three seconds, the unit will revert to the primary Airspeed display.

DISCLAIMERS:

Products from Radiant Technology are not designed to be used in applications where their failure would endanger safe flight or human life in any way.

They are intended solely for use in VFR conditions. They are not certified to meet any Technical Standard Order and are not produced under a Parts Manufacturing Authority (TSO / PMA). As a result, if installed in the aircraft, they are suitable only for use in experimental and ultralight aircraft, and in Light Sport Aircraft, if meeting the requirements of the respective manufacturer.

WARRANTY:

Your new Radiant Technology instrument carries a three-year warranty, from the invoice date. Please contact us at

[e-mail] should your product need warranty service. There is an additional charge for international warranty service.

RETURN / REFUND INFORMATION:

Must be returned in new, uninstalled, resalable condition within 14 days after receipt. Ship to Radiant Technology, PO Box 20690, Wichita KS 67208.