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Index 205
M
Magnetic Loops Noise, 28
Making Multimeter Measurements, 53–56
externally triggered measurements, 54
maximizing accuracy, 56
maximizing speed, 55
measurement format, 54
single measurements, 54
using FETCh? command, 53
using INITiate commands, 53
using MEASure commands, 53
using READ? command, 53
Math Operations, 41–44
AVERage function, 41, 74, 76
dB measurements, 42–43, 75–76
dBm measurements, 43, 75–76
LIMit function, 44, 76–77
NULL (relative) function, 41–42, 76, 78
query function, 76
Maximum
accuracy
, 56
average operation value, 74
current, 15
measurement speed, 55
voltage, 15
MEASure Subsystem, 101–110
MEAS:CURRent:AC?, 102
MEAS:CURRent:DC?, 103
MEAS:FREQuency?, 104
MEAS:FRESistance?, 105
MEAS:PERiod?, 106
MEAS:RESistance?, 107
MEAS:VOLTage:AC?, 108
MEAS[:VOLTage[:DC]]?, 109
MEAS[:VOLTage[:DC]]:RATio?, 110
Measurements
2-wire ohms connections
, 21, 30
4-wire ohms connections, 21, 29
ac below full scale, 34
ac current
characteristics
, 175
high speed, 36
ac voltage
characteristics
, 175
high speed, 36
loading errors (ac volts), 34
configuration, 37–40
ac signal filter, 37, 127–128
autozero, 40
integration time, 39
ranging, 40
Measurements (continued)
configuration (continued)
resolution, 38
current connections, 22
dB, 42–43, 75
dBm, 43, 75
dc current
characteristics
, 172
errors, 32
dc voltage, 25–28
characteristics, 172
common mode rejection (CMR), 27
ground loops noise, 28
high speed, 31
leakage current errors, 26
loading errors (dc volts), 26
magnetic loops noise, 28
ratio, 95, 110
rejecting power line noise voltages, 27
thermal EMF errors, 25
error, 180–181
frequency characteristics, 177
frequency connections, 19
functional connections, 19–22
high accuracy, 184
making, 53–56
externally triggered measurements, 54
maximizing accuracy, 56, 193–198
maximizing speed, 55, 193–198
measurement format, 54
single measurements, 54
using FETCh? command, 53, 98, 198
using INITiate commands, 53
using MEASure commands, 53
using READ? command, 53
period characteristics, 177
period connections, 19
resistance, 29–31
2-wire ohms, 30
4-wire ohms, 29
high resistance measurement errors, 31
high speed measurements, 31
power dissipation effects, 31
settling time effects, 31
retrieving from memory, 98
speed and accuracy tradeoffs, 193–198
temperature measurement resistors, 31
true RMS ac, 32–35
tutorial, 25
voltage connections, 20
voltage ratio (Vdc) connections, 20