Insulation Multimeters
Calibration Adjustment Procedure
23
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
H
on the UUT, turn the rotary switch from
OFF
to
B
. The
UUT should display
Z
CAL
.
2.
Press
h
once to see the calibration counter. For example
n001
.
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
1234
.
Changing the Password
Use the following steps to change the password on the UUT:
1.
While holding down
H
on the UUT, turn the rotary switch from
OFF
to
B
. The
UUT displays
Z
CAL
.
2.
Press
h
once to see the calibration counter.
3.
Press
h
again to start the password entry. The UUT displays
?.?.?.?
.
The following keys represent the digit indicated below when entering or changing
the password:
h
= 1
m
Unused
f
Unused
r
= 2
H
= 3
t
= 4
G
= 5
4.
Press the four keys to enter the old password. If changing the password for the
first time, enter
h
(1),
r
(2),
H
(3), and
t
(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.
6.
Press the four keys representing the new password.
7.
Press
h
to store the new password.
Restoring the Default Password
If the calibration password is forgotten, the default password (
1234
) can be restored
using the following steps.
1.
Turn the rotary switch from
OFF
to
B
.
