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OPERATING SPEED
The following diagram illustrates the factors that determine a DMM’s reading rate.
Command
Receive and
Interpret
GPIB
Command
Function,
Speed or
Range
Change
Stored
Setup
Change
Measurement
Settle
Trigger
Link
or
Ext.
Trigger
Auto Zero
On
Auto Zero
Off
Trigger Control
Auto Zero
On
Auto Zero
Off
Measure
Engineering Units Conversion
Math, Limits Calculation
Measurement
Settle
Data
Memory
Formatting
GPIB Data
Transmission
Display
Update
Command Receive and
Interpret Speed
Function Reading Rates to
Memory (see rates for each
measurement function).
Autorange Speed (if on)
Function Change Speed
Range Change Speed
Measurement Speed
Change Time
Trigger Speed
Settling Times
(included in reading rates)
Engineering Units Conversion
Speed (included in reading
rates for multiple measure-
ments; add to total time for
single measurements only)
Math Speed (only if Math on)
Stop here for Speed to
Memory.
Data Format Speed
Data Transfer Ratess
Display Speed
Function Reading
Rates to GPIB
(see rates for each
measurement
function).
COMMAND RECEIVE AND INTERPRET SPEED
FASTEST
TYPICAL
SLOWEST
Time per character
0.16 ms
0.28 ms
0.66 ms
Characters per second
6250
3751
1515
TYPICAL COMMAND TIMES
Receive and
Rate
Command
Interpret Time
(per second)
SENSE1:VOLTAGE:AC:
RESOLUTION MAXIMUM
9.4 ms
106
VOLT:AC:RES:MAX
4.1 ms
243
SENSE1:FUNC 'VOLT:AC"
6.3 ms
158
RESISTANCE:RANGE:UPPER 1E9
9.0 ms
111
STATUS:QUEUE:CLEAR
5.1 ms
196
STAT:QUE:CLE
3.1 ms
322
*TRG
1.2 ms
833
FUNCTION CHANGE SPEED
1
AUTO ZERO OFF
AUTO ZERO ON
FROM
TO
RATE
RATE
Function
Function
Range(s)
TIME
(per second)
TIME
(per second)
Any
DCV
200mV, 2V
8 . 1 ms
1 2 0
3 6
ms
2 7
20V
8 . 1 ms
1 2 0
8 . 6 ms
1 1 0
200V
2 4
ms
4 0
5 2
ms
1 9
1000V
1 1
ms
1 6 0
1 0 . 2 ms
1 9 0
Any
ACV
Any
5 6 3
ms
1 . 8
5 6 3
ms
1 . 8
Any except ACI
DCI
200
μ
A, 2mA, 20mA
4 . 5 ms
2 2 0
5 . 1 ms
1 9 0
200mA, 2A
6 . 0 ms
1 6 0
6 . 6 ms
1 5 0
ACI
Any
2 1 . 1 ms
4 5
2 2
ms
4 5
Any
ACI
Any
5 2 1
ms
1 . 9
5 2 1
ms
1 . 9
Any
Ohms (2-wire)
20
Ω
, 200
Ω
, 2k
Ω
, 20k
Ω
6 . 0 ms
1 6 5
3 4
ms
2 9
2 0 0 k
Ω
2 6
ms
3 8
6 1
ms
1 6
2M
Ω
9 5
ms
1 0 . 5
4 2 5
ms
2 . 4
2 0 M
Ω
2 6 5
ms
4
6 9 0
ms
1 . 4
200M
Ω
, 1G
Ω
3 6 6
ms
3
5 . 5 ms
1 8 0
Any
Ohms (4-wire)
20
Ω
, 200
Ω
, 2k
Ω
, 20k
Ω
1 2
ms
1 4 0
3 4 . 1 ms
2 9
2 0 0 k
Ω
2 6
ms
3 8
6 0
ms
1 6
Any except ACI and Ohms
Frequency
8
Any
6 1
ms
1 6
6 0
ms
1 7
ACI, Ohms (4-wire)
Any
7 9
ms
1 2
7 5
ms
1 3
Ohms (2-wire)
Any
4 1 8
ms
2
4 1 6
ms
2
Any
RTD Temp. (2-wire)
Any
6 . 0 ms
1 6 5
3 3
ms
3 0
RTD Temp. (4-wire)
Any
1 1 . 5 ms
1 5 0
3 7
ms
2 7
TC Temp.
Any
8 . 0 ms
1 2 5
3 5
ms
2 8
MEASUREMENT SPEED CHANGE TIMES
1,2
Typical delay before first reading after making a speed change.
AUTO ZERO OFF AUTO ZERO ON
FUNCTION
From
To
Time
Time
DCV, DCI, ACI
Any
≤
0.1 PLC
66 ms
44 ms
Any
1 PLC
190 ms
140 ms
Any
10 PLC
1540 ms
1195 ms
ACV
Any
≤
0.1 PLC
120 ms
100 ms
Any
1 PLC
250 ms
197 ms
Any
10 PLC
1600 ms
1250 ms
Ohms (2-wire)
Any
≤
0.1 PLC
69 ms
57 ms
Any
1 PLC
195 ms
170 ms
Any
10 PLC
1540 ms
1370 ms
Ohms (4-wire)
Any
≤
0.1 PLC
110 ms
46 ms
Any
1 PLC
240 ms
165 ms
Any
10 PLC
1590 ms
1370 ms
TC Temperature
Any
≤
0.1 PLC
80 ms
55 ms
Any
1 PLC
195 ms
170 ms
Any
10 PLC
1545 ms
1370 ms