Front Panel Operation
Resetting the Calibrator
4
4-7
Table 4-1. Factory Defaults for SETUP
Features
Temperature Standard its-90 Display Contrast* level 7,7
Host Connection gpib (IEEE-488) Display Brightness* level 1,0
GPIB Port Address 4 RTD Power Up
Default Type
pt385
Serial Ports 8 bits, 1 stop bit, xon/xoff, parity
none, 9600 baud, wait 30 sec.
Thermocouple Power
Up Default Type
K
EOL (end of line) CRLF Source Preference 5500
EOF (end of file) 012,000 Current Limits ±11 A
Remote I/F term
Voltage Limits ±1020 V
Remote commands (see Chapter 6)
SRQSTR SRQ: %02x %02x %04x %04x *PUD string cleared
* Output Display and Control Display, respectively. There are 8 levels: 0,1,2,3,4,5,6,7.
4-10. Resetting the Calibrator
At any time during front panel operation (not remote operation), you can return the
5500A Calibrator to the power-up state by pressing R, except after an error message,
which is cleared by pressing a blue softkey. Pressing the R key does the following:
• Returns the calibrator to the power-up state: 0 V dc, standby, 330 mV range and all
OUTPUT SETUP menus set to their most recent default values.
• Clears the stored values for limits and error mode reference.
4-11. Zeroing the Calibrator
Zeroing recalibrates internal circuitry, most notably dc offsets in all ranges of operation.
To meet the specifications in Chapter 1, zeroing is required every seven days, or when
the 5500A Calibrator ambient temperature changes by more than 5ºC. Zeroing is
particularly important when your calibration workload has 1 mΩ and 1 mV resolution,
and when there are significant temperature changes in the 5500A Calibrator work
environment. There are two zeroing functions: total instrument zero (ZERO) and ohms-
only zero (OHMS ZERO).
Complete the following procedure to zero the calibrator. (Note: The 5500A Calibrator
rear-panel CALIBRATION switch does not have to be enabled for this procedure.)
1. Turn on the Calibrator and allow a warm-up period of at least 30 minutes.
2. Press the R key.
3. Install a copper short circuit in the front panel TC connector (total instrument zero
only).
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