Basic Maintenance; Opening The Meter Case - Fluke 87 III Series Service Information

Equipment
Calibrator

Basic Maintenance

To avoid shock, remove the test leads and any input signals
before opening the case or replacing the battery or fuses.

Opening the Meter Case

To avoid unintended circuit shorting, always place the
uncovered Meter assembly on a protective surface. When the
case of the Meter is open, circuit connections are exposed.
To open the Meter case, refer to Figures 1 and 2 and do the following:
1. Disconnect test leads from any live source, turn the rotary switch to OFF, and
remove the test leads from the front terminals.
2. Remove the battery door by using a flat-blade screwdriver to the turn the battery
door screws 1/4-turn counterclockwise.
3. The case bottom is secured to the case top by three screws and two internal snaps (at
the LCD end). Using a Phillips-head screwdriver, remove the three screws.
The gasket between the two case halves is sealed to, and must remain
with, the case bottom. The case top lifts away from the gasket easily. Do
not damage the gasket or attempt to separate the case bottom from the
gasket.
4. Hold the Meter display side up.
5. Lifting up on the input terminal end, disengage the case top from the gasket.
6. Gently unsnap the case top at the display end. (See Figure 2).
Table 2. Required Equipment
Required Characteristics
AC Voltage Range: 0-1000V ac
Accuracy: ±0.12 %
Frequency Range: 60-20000 Hz
Accuracy: ±3 %
DC Voltage Range: 0-1000V dc
Accuracy: ±0.012 %
Current Range: 350 µA-2A
AC (60 Hz to 1 kHz): ±0.25 %
Accuracy:
DC: ±0.05 %
Frequency Source: 19.999 kHz - 199.99 kHz
Accuracy: ±0.0025 %
Amplitude: 150 mV to 6V RMS
Accuracy: ±5 %
Range: 1Ω - 100 MΩ
Accuracy: 0.065 %
WWarning
Caution
Recommended Model
Fluke 5500A Multi-Product
Calibrator or equivalent
Note
Multimeters
Basic Maintenance
9