User`s guide
Table Of Contents
- User's Guide
- Resolution
- DC Voltage
- AC Voltage
- Resistance
- Power Measurements
- Attention: Transistor, capacitance and temperature measureme
- Input Terminals
- Transistor Socket hFE (PNP NPN)
- Attention: Never exceed the maximum input limits (1000VDC
- AC / DC Voltage Displays
- Attention: Never measure current in circuits where over 250
- Attention: Make sure all objects, circuits and components un
- Attention: During diode tests, ensure that components and ci
- Attention: Observe the max. input limits. Never connect volt
- POWER MEASUREMENTS
- Software for PC Interface
- Using the DOS Software
- Input Terminals
11 382860 Ver. 2.1 09/04
Resistance Measurements
Attention: Make sure all objects, circuits and components under test are NOT
powered!
1. Set the rotary switch to the Ohms position. Press the AC/DC key so that the
continuity musical symbol does NOT appear on the LCD.
2. Connect the test-leads to the device under test. Ensure that all power is
removed from devices under test. Auto Range selects the appropriate range
automatically.
3. Normally the resistance of the test-leads can be disregarded (approx. 0.1 to
0.2 Ohm). However, this small value can cause inaccuracy in the 400 Ohm
range. To determine the error before measurement, short the test-lead tips
and read the resistance value on the display. Subtract this value from
readings to cancel lead resistance errors.
4. During resistance tests, make sure that the contact between test leads and
circuits is optimized. Make sure the test points are free of dirt, oil or solder
flux, etc. since these may seriously influence the measurement.
5. For resistance measurements >4M, the display will take several seconds to
stabilize.
6. The left-most sub-LCD updates one second later than the main LCD, the
middle sub-display 2 seconds later and the right-most sub-display 3 seconds
later.
Diode Test
Attention: During diode tests, ensure that components and circuits under test are NOT
powered. All existing capacities must be discharged.
1. Set the Rotary Switch to the diode symbol position. The diode icon will be
displayed. Manual range selection is not possible during diode tests.
2. Connect the test-lead tips to the object under test. The RED probe-tip
connects to the anode of the device under test and the BLACK test-lead tip
connects to the cathode.
3. A diode’s forward voltage should measure approx. 0.25 V (Germanium) or 0.7
V (Silicon), if the diode is GOOD.
4. Reverse the probe-tips (Red to the cathode and Black to the anode) to check
the diode’s reverse status.
5. If “OL” (overload) is displayed, the diode is open or measures above 2.0 V. If
a value between 0 V and approx. 2.0 is displayed, then a good forward
voltage drop exists.
6. During diode tests the center sub-display indicates GOOD if the diode is o.k.
If the diode is defective (short circuit) or low resistance short then SHORT is
displayed. If the diode is defective due to high resistance or if the test leads
are accidentally reversed (red to cathode and black to the anode) then
“OPEN” for (open circuit) is displayed.
NOTE: Checking LED components in Diode Test mode
The meter’s test voltage in diode test mode is sufficient to “illuminate” most
(low current) LEDs. If the LED has an operating voltage of more than 2.0 V,
the meter will falsely indicate that the LED is defective when it actually may be
good.