Agilent Technologies 34970A, Service Manual, Page: 79 / 273

Gain Verification
This procedure is used to check the “full scale” reading accuracy of
the internal DMM. Verification checks are performed only for those
functions and ranges with unique gain calibration constants.
Begin verification by selecting a measuring function and range.
Make sure you have read “Test Considerations” on page 71.
DC VOLTS, Resistance, and DC CURRENT Gain Verification Test
1
Make sure you have read “Test Considerations” on page 71.
2
Select each function and range in the order shown below.
Before executing each test, you must press
to enable reading
monitoring on the selected channel (or use the
ROUTe:MON
command
from the remote interface).
3
Compare measurement results to the appropriate test limits shown
in the table. (Be certain to allow for appropriate source settling.)
Input
Channel 210
Function
[1]
Range
Quick
Check
Error from Nominal
24 hour 90 day 1 year
100 mV
1 V
10 V
100 V
300 V DC Volts 100 mV
1 V
10 V
100 V
300 V
Q
Q
±
6.5
µ
V
±
26
µ
V
±
190
µ
V
±
2.6 mV
±
12 mV
±
8
µ
V
±
37
µ
V
±
250
µ
V
±
4.1 mV
±
19.5 mV
±
9
µ
V
±
47
µ
V
±
400
µ
V
±
5.1 mV
±
22.5 mV
100
Ω
1 k
Ω
10 k
Ω
100 k
Ω
1 M
Ω
10 M
Ω
100 M
Ω
[3]
2-Wire Ohms
[2]
and
4-Wire Ohms
100
Ω
1 k
Ω
10 k
Ω
100 k
Ω
1 M
Ω
10 M
Ω
100 M
Ω
Q
Q
±
6.5 m
Ω
±
26 m
Ω
±
250 m
Ω
±
2.5
Ω
±
30
Ω
±
1.6 k
Ω
±
310 k
Ω
±
12 m
Ω
±
90 m
Ω
±
900 m
Ω
±
9
Ω
±
90
Ω
±
2.1 k
Ω
±
801 k
Ω
±
14 m
Ω
±
110 m
Ω
±
1.1
Ω
±
11
Ω
±
110
Ω
±
4.1 k
Ω
±
810 k
Ω
Input
Channel 221
Function
[1]
Range
Quick
Check
Error from Nominal
24 hour 90 day 1 year
10 mA
100 mA
1 A DC Current 10 mA
100 mA
1 A
Q
±
1.5
µ
A
±
14
µ
A
±
560
µ
A
±
5
µ
A
±
35
µ
A
±
900
µ
A
±
7
µ
A
±
55
µ
A
±
1.1 mA
[1] Select 6
1 ⁄
2
digit resolution.
[2] The 2-wire ohms resistance verification test is optional (see note on Page 82). For 2-wire
ohms, an additional 1
Ω
of error must be added (see Page 71). Add a 1-second channel delay
when using Fluke 5700 in 2-wire compensated mode. This avoids response time issues with
2-wire compensation when 34970A’s current source contains a pulse.
[3] Verify only, no adjustment required.
Q
: Quick performance verification test points.
4
Chapter 4 Calibration Procedures
Internal DMM Verification Tests
77