MODEL 120 TRUE RMS MULTIMETER
2
Diode Tester:
Range
Resolution
Accuracy
Test Current
Test Voltage
Overload protection
1mV 1% +2 <1mA <3.5V 600Vrms
Frequency (Autoranging):
Range
Resolution
Accuracy
Sensitivity
Overload Protection
4KHz 1Hz 0.05%+1 <1Vrms 600Vrms
40KHz 10Hz 0.05%+1
<1Vrms
600Vrms
400KHz 100Hz 0.05%+1
<1Vrms
600Vrms
4MHz 1KHz 0.05%+1
<3Vrms
600Vrms
40MHZ 10KHz 0.05%+1
<10Vrms
600Vrms
RPM (Autoranging):
Range
Resolution
Accuracy
Sensitivity
Overload Protection
40K RPM 0.01K RPM 0.05%+1 <1Vrms 600Vrms
400K RPM 0.1K RPM 0.05%+1
<1Vrms
600Vrms
4M RPM 1K RPM 0.05%+1
<1Vrms
600Vrms
40M RPM 10K RPM 0.05%+1
<3Vrms
600Vrms
400M RPM 100K RPM 0.05%+1
<10Vrms
600Vrms
Temperature (°C/°F)
Range
Resolution
Accuracy
Overload protection
°C
1
°
-50 to 0°C: 1%+4
0 to 1000
°C: 1%+3
600Vrms
°F
1
°
-58 to 32
°F: 1%+8
32 to 1832
°F: 1%+6
600Vrms
Capacitance (Autoranging)
Range
Resolution
Accuracy
Overload protection
4nF 1PF 1.9%+20 600Vrms
40nF 10PF 1.5%+10 600Vrms
400nF 100PF 1.5%+10 600Vrms
4uF 1nF 1.5%+10 600Vrms
40uF 10nF 1.9%+10 600Vrms
400uF 100nF 1.9%+10
600Vrms
4mF 1uF 1.9%+10
600Vrms
40mF 10uF 3%+10 600Vrms
Accuracy specification: ± ([…% of reading] + [… number of least significant digits]) at
18°C to 28°C (64°F to 82°F) at less than 80% RH
True RMS accuracy for ACV and ACA are specified from 5% to
100% of range. Add 1% of reading for crest factor between 1.4
and 3 at full scale, or less than 6 at half scale.
Electromagnetic compatibility:
Vac and Aac only: RF field = 3V/m
Total accuracy: Specified accuracy + 2% of range
Digital display: 4000 counts
Sampling rate: Twice per second
Analog display: 41 segments
Sampling rate: 20 times per second
Overrange indication: Displays ‘OL’ when value exceeds range selected
Digital Output: Bi-directional RS232. (Cable and software optional.)
Power requirement: 9 Volt battery, NEDA 1604 or JIS 006P or IEC 6F22
Battery life: 100 hours typical. Low battery indication.
Safety: 1000V CAT III, Regulation EN61010: Part 1:1993
Dimensions: Meter only: 198×86×38mm (7.8×3.4×1.5 in)
With holster: 209×94×48mm (8.2×3.7×1.9 in)
Weight: Meter only: Approx. 430g (15.2 oz)
With holster: Approx. 600g (21.3 oz)
MODEL 120 TRUE RMS MULTIMETER
9
6.0 Battery and Fuse Replacement: WARNING
To prevent electrical hazard or shock, turn multimeter off and disconnect test leads before removing back cover.
6.1 Opening the Instrument Case
When the low battery indicator
shows in the display or when a
fuse blows due to an overload
condition, the case must be
opened to replace the battery
or fuse(s).
Set the Function Selector
switch to the OFF position.
Turn the unit over and remove
the five screws from the back
as shown in Figure 1.
Turn the unit face up and
carefully separate the case
halves as shown in Figure 2.
6.2 Battery Replacement
This instrument uses a single 9V, NEDA 1604 or IEC6F22 or JIS006P battery. When
installing a new battery, be careful to route the battery leads through the slot in the
battery enclosure. Failure to do so could result in damage to the leads upon replacement
of the top half of the instrument case.
6.3 Fuse Replacement
WARNING
To avoid damage to the instrument or potential electrical hazard or shock, replace fuses with exact
replacements. Do not use higher rated fuses in either location.
Remove and replace the defective fuse with an exact replacement.
Fuse ratings are as follows:
Fuse 1: F0.5A/600V 10
³
× 38mm Fast Blow
Fuse 2:F15A/600V 10
³
× 38mm Fast Blow
6.4 Closin g the Instrument Case
Ensure the Function Selector switch has not been rotated from the position when it was
removed. Check to be certain that the battery leads are safely routed through the slot
provided for this purpose. Replace the top half of the instrument case, turn the
instrument over, and replace the five screws in the back.
Note: Do not over tighten screws. Excessive tightening could strip the threads in the
plastic case.
Figure 2
Figure 1
Screws
Fuse 1
0.5A fuse
Battery
Fuse 2
15A fuse