Signametrics
12
2.3.4 Extended Resistance Measurements (SMU2064)
Characteristics
Test Voltage
Adjustable between -10V and +10V in 5mV steps
Accuracy ± (% of r Amps) [1]
Range
Measurement range
Resol
ution
Current Limit [3]
90 Days
23
C
5
C
One Year 23
C
5
C
400k
1k
to 100M
10
25µA
0.2 +
50
0.33 + 9
0
4M
10k
to 1G
100
2.5µA
0.3 +
350
0.43
+
550
40M
100k
to 10G
1k
250nA
0.4 +
3k
0.55 + 4.5k
[1] With Aperture set to
≥
0.5 Sec, and within one hour from Zero (Relative control).
[2] Multiply “% of reading” by 1/Voltage Source for applied voltages below 1V
[3] Limit is reached when the test current exceeds the Current Limit, or it is below 0.04% of this value.
2.3.5 Offset Ohms Measurements (SMU2064)
The purpose of Offset Ohms is to compensate for errors due to DC voltages which are in series with the
resistance being measured.
DMMSetOffsetOhms()
function provides the means to control this
operation. It is disabled by default.
Characteristics
Offset correction range:
240mV or 2.4V depending on selected range
Application:
2-Wire and 4-Wire Ohms
Offset voltage:
Depends on head-room; range and measured resistance value.
Range
Vo limits [1]
Measurement limits [2]
24
& 240
-230mV to 230mV
I*R + Vo < +220mV
2.4k to 24M
-2.3V to 2.3V
I*R + Vo < +2.2V
[1] With resistance, R, less than 10% of range.
[2] R – Measured resistance, I – Test current, Voofset – Offset Voltage
2.4 AC Voltage Measurements
Input Characteristics
Input Resistance
1 M
, shunted by < 300 pF, all ranges
Max. Crest Factor
4 at Full Scale, increasing to 7 at Lowest Specified Voltage
AC coupled
Specified range: 10 Hz to 100 kHz
Typical Settling time
< 0.5 sec to within 0.1% of final value
Typical Settling time, Fast RMS
< 0.05 sec to within 0.1% of final value
2.4.1 AC Voltage True RMS Measurement
Range
Full Scale 7-½ Digits
Lowest specified Voltage
Resolution
240 mV
240.0000 mV
5 mV [1]
100
V
2.4 V
2.400000 V
20 mV
1
V
24 V
24.00000 V
200 mV
10
V
240 V
240.0000 V
2 V
100
V
330 V
330.0000 V
2.5 V
100
V
[1] Between 5 mV and 10 mV, add 100
V additional errors to the accuracy table below.
[2] Signal is limited to 8x10
6
Volt Hz Product. For example, the largest frequency input at 250 V is 32 kHz, or
8x10
6
Volt x Hz.
ACV Noise Rejection
Common Mode rejection, for 50 Hz or 60 Hz with 1 k
imbalance in either lead, is better
than 60 dB.
