MODEL 120 TRUE RMS MULTIMETER
6.0Battery and Fuse Replacement:
WARNING
To prevent electrical hazard or shock, turn multimeter off and disconnect test leads before removing back cover.
MODEL 120 TRUE RMS MULTIMETER
Diode Tester:
Range | Resolution | Accuracy | Test Current | Test Voltage | Overload protection | ||
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| 1mV | 1% +2 | <1mA | <3.5V | 600Vrms |
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Frequency (Autoranging): |
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6.1Opening 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.
Figure 2
Fuse 2 15A fuse
Figure 1
Screws
Fuse 1 0.5A fuse
Battery
Range | Resolution | Accuracy | Sensitivity | Overload Protection |
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4KHz | 1Hz | 0.05%+1 | <1Vrms | 600Vrms |
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40KHz | 10Hz | 0.05%+1 | <1Vrms | 600Vrms |
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400KHz | 100Hz | 0.05%+1 | <1Vrms | 600Vrms |
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4MHz | 1KHz | 0.05%+1 | <3Vrms | 600Vrms |
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40MHZ | 10KHz | 0.05%+1 | <10Vrms | 600Vrms |
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RPM (Autoranging): |
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Range | Resolution | Accuracy | Sensitivity | Overload Protection |
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40K RPM | 0.01K RPM | 0.05%+1 | <1Vrms | 600Vrms |
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400K RPM | 0.1K RPM | 0.05%+1 | <1Vrms | 600Vrms |
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4M RPM | 1K RPM | 0.05%+1 | <1Vrms | 600Vrms |
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40M RPM | 10K RPM | 0.05%+1 | <3Vrms | 600Vrms |
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400M RPM | 100K RPM | 0.05%+1 | <10Vrms | 600Vrms |
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Temperature (°C/°F) |
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Range | Resolution | Accuracy | Overload protection | |
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°C | 1° | 0 to 1000°C: 1%+3 | 600Vrms | |
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°F | 1° | 32 to 1832°F: 1%+6 | 600Vrms | |
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6.2Battery 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.
6.3Fuse 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 ≥ × 38mm Fast Blow
Fuse 2: F15A/600V 10 ≥ × 38mm Fast Blow
6.4Closing 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.
Capacitance (Autoranging) |
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Range | Resolution | Accuracy | Overload protection |
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4nF | 1PF | 1.9%+20 | 600Vrms |
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40nF | 10PF | 1.5%+10 | 600Vrms |
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400nF | 100PF | 1.5%+10 | 600Vrms |
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4uF | 1nF | 1.5%+10 | 600Vrms |
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40uF | 10nF | 1.9%+10 | 600Vrms |
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400uF | 100nF | 1.9%+10 | 600Vrms |
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4mF | 1uF | 1.9%+10 | 600Vrms |
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40mF | 10uF | 3%+10 | 600Vrms |
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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: | |
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) |
9 | 2 |