87V MAX
Calibration Information
14
Table 2. Accuracy Tests (cont.)
Step
Test
Function
Range 5520A Output Display Reading
52 mVdc
Temperature
4
0 °C -1.0 to 1.0
53
100 °C 98.0 to 102.0
54 Backlight Press backlight button Backlight comes on
55 Press backlight button Backlight intensifies
56 Press backlight button Backlight goes off
[1] Remove test leads from unit.
[2] Use REL to compensate for internal Meter and lead capacitance (must disconnect test leads from calibrator before pushing REL)
[3] The Meter accuracy is not specified at this input signal frequency with Low-pass filter selected. The display reading shown, checks
that the Low-pass filter is active and follows an expected roll-off curve.
[4] To ensure accurate measurement, the Meter and thermocouple adapter must be at the same temperature. After connecting the
thermocouple adapter to the Meter allow for reading to stabilize before recording display reading.
Calibration Adjustments
Perform the Calibration Adjustment Procedure if the Meter fails any performance
tests. If the adjustment routine is discontinued prior to completion, no changes
are made to the calibration constants that are stored in memory. The following is
an explanation of the pushbutton features and requirements to enter the CAL
mode.
Cal Mode Pushbutton Functions
• The CAL mode will be initiated by holding down the MINMAX pushbutton at
power up and entering a four-digit password.
• The AutoHOLD pushbutton will act as an "ENTER" key and will advance
through the CAL initiation and adjustment procedure steps.
• The pushbuttons are used to select a four-digit password.
During initiation of the CAL mode, a display count will show how many times
calibration constants have been written to memory.
Entering and Displaying the Four-Digit Password
When the Meter was manufactured it was given a default password of 1234. The
following pushbuttons are used to select the password. Each pushbutton
represents the indicated digit.
Yellow = 1 MINMAX = 2 RANGE = 3 AutoHOLD = 4
Backlight = 5 Continuity = 6 REL = 7 Hz = 8
After selecting the password, the user has two choices:
Pressing AutoHOLD will display "" which indicates correct password and
successful entry. You may now proceed with the first calibration step.
Pressing RANGE will display "", which indicates correct password, proceed
to select a new password.
If the password is incorrect, the concluding AutoHOLD or RANGE pushbutton
press will instead cause the Meter to double beep and the display will show
"". The password entry process was unsuccessful and can be tried again or
you may exit this mode by turning the Meter off.
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