Insulation Multimeters
Calibration Adjustment Procedure
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Calibration Adjustment Procedure
The following sections comprise the Calibration Adjustment Procedure. The
procedure is meant to bring the UUT back into specification following repair of
the UUT or when the UUT fails the Performance Test. The required equipment is
listed earlier in Table 2.
The Meter features closed-case calibration adjustment using known reference
sources. During the procedures, known reference source values are applied to
the meter; the Meter calculates correction factors and stores them in nonvolatile
memory.
Calibration Adjustment Counter
The Meter contains a calibration adjustment counter. The counter is incremented
each time a Calibration Adjustment Procedure is completed. The value in the
counter can be recorded and used to show that no adjustments have been made
during a calibration cycle.
Use the following steps to view the calibration counter on the UUT.
1. While holding down on the UUT, turn the rotary switch from OFF to F.
The UUT should display Z .
2. Press once to see the calibration counter. For example .
3. Turn the rotary switch to OFF.
Calibration Adjustment Password
To start the Calibration Adjustment Procedure, the correct four-digit password
must be entered. The password can be changed or reset to the default as
described in following paragraphs. The default password is .
Changing the Password
Use these steps to change the password on a UUT with SN >32980000:
1. While holding down on the UUT, turn the rotary switch from OFF to F.
The UUT displays Z .
2. Press once to see the calibration counter.
3. Press again to start the password entry. The UUT displays ????.
The following keys represent the digit indicated below when entering or
changing the password:
= 1 m
Unused
Unused
r = 2
Unused
= 4
Unused
H = 3
G = 5
4. Press the four keys to enter the old password. If changing the password for
the first time, enter (1), r (2), H (3), and (4).
5. Press r to change the password. The UUT displays //// if the old
password is correct. If the password is not correct, the UUT emits a double
beep, displays ???? and the password must be entered again. Repeat step 4.
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