The following table lists the bit definitions for the Questionable Data Register:
The overload bits are set once per INITiate command. If you clear an overload bit, it will not be set again
until a new INITiate is sent.
Bit
Number
Bit Name Decimal
Value
Definition
0 Voltage Overload 1 Only reported as event. Returns 0. Read the Event Register.
1 Current Overload 2 Only reported as event. Returns 0. Read the Event Register.
2 Not Used 4 (Reserved for future use)
3 Not Used 8 (Reserved for future use)
4 Temperature Overload 16 Only reported as event. Returns 0. Read the Event Register.
5 Frequency
Overload/Underflow
32 Only reported as event. Returns 0. Read the Event Register.
6 Not Used 64 (Reserved for future use)
7 Not Used 128 (Reserved for future use)
8 Calibration Corrupt 256 At least one calibration constant is corrupt.
9 Resistance Overload 512 Only reported as event. Returns 0. Read the Event Register.
10 Not Used 1024 (Reserved for future use)
11 Lower Limit Failed 2048 The most recent measurement failed the lower limit test.
12 Upper Limit Failed 4096 The most recent measurement failed the upper limit test.
13 Not Used 8192 (Reserved for future use)
14 Memory Overflow 16384 Reading memory is full. One or more (oldest) measurements
have been lost.
15 Not Used 32768 (Reserved for future use)
Agilent Truevolt Series DMM Operating and Service Guide 225
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