Fluke 2620A User Manual

Users Manual

4-22

Note

Whenever the Instrument Event Register is read, the condition bits are cleared.

This register is used in conjunction with the Instrument Event Enable Register to determine the conditions
under which the Instrument Event Bit of the Status Byte is set.

0

ALT

Alarm Limit Transition. Set high (1) when any measurement value has
transitioned into or out of alarm. Alarms are defined through the front panel or
the computer interface (ALARM_LIMIT). This bit is cleared when alarms or
review values are cleared.

1

TOB

Totalize Overflow. Set high (1) when the Totalizer overflows (>65,535). This
bit is cleared when the Totalizer is zeroed from the front panel or set to some
other non-overflow value (<65,535) with the computer interface TOTAL
command.

2

OTC

Open Thermocouple. Set high (1) when open thermocouple checking is
enabled and any thermocouple channel is measured with a source
impedance greater than 1 to 4 kilohms.

3

CCB

Calibration Corrupted. Set high (1) when the instrument calibration data is
corrupted. When a calibration data check shows a corruption of calibration
data, the calibration alarm bit remains set in the Instrument Status Register
until the instrument is recalibrated.

4

CNC

Configuration Corrupted. The instrument configuration stored in NVRAM has
been found to be corrupted. The RAM CRC is no longer valid.

5,6

not used

7

SCB

Scan Complete. Set high (1) when a measurement scan has been completed.

Generally, RS-232 and IEEE-488 commands are identical. A few exceptions apply only
when the RS-232 interface is active.

See Table 4-7 for a summary of computer interface commands and queries. A detailed
description of each command or query can be found in Table 4-8. (alphabetically
arranged.)