8508A
Service Manual
1-12
AC Voltage (Secondary Specifications)
[1] [2]
Temperature Coefficient
15 °C - 30 °C
5 °C - 15 °C
30 °C - 40 °C
Range Frequency
(Hz)
± ppm Reading/°C
200 mV
1 - 10
5
10
10 - 40
5
10
40 - 100
5
10
100 - 2 k
5
10
2 k - 10 k
12
20
10 k - 30 k
15
20
30 k - 100 k
40
60
2 V
1 - 10
5
10
20 V
10 - 40
5
10
200 V
40 - 100
5
10
100 - 2 k
5
10
2 k - 10 k
10
15
10 k - 30 k
12
20
30 k - 100 k
40
60
100 k - 300 k
60
90
300 k - 1 M
80
120
1000 V
1 - 10
5
10
10 - 40
5
10
40 - 10 k
10
15
10 k - 30 k
12
20
30 k - 100 k
40
60
Type
....................................................................... True rms, AC coupled measures AC component with up to 1000 V DC
bias on any range. DC coupled gives
)
dc
(ac
2
2
+
CMRR
(1 k
Ω
unbalance)
[5]
..................................... > 90 dB DC - 60 Hz
Crest Factor
200 mV to 200 V ranges ........................................ 10:1 at 12 % range, 5:1 at 50 % range, 2.5:1 at full range
1000 V range ......................................................... 10:1 at 25 % range, 5:1 at full range
Protection
(All ranges)........................................... 1 kV rms
Input Impedance
................................................... 1 M
Ω
in parallel with 150 pF
DC Accuracy
(DC Coupled)................................... Add ±(50 ppm R 50 ppm Range + 20
μ
V)
Ratio Accuracy
Range to Range...................................................... ±(Net Front Input Ac Net Rear Input Accuracy)
Within Range ......................................................... Apply 24 hour or 20 minute Transfer Uncertainty specifications
Settling Time
(to 100 ppm step size)
100 Hz filter............................................................. < 0.5 s
40 Hz filter............................................................... < 1.25 s
10 Hz filter............................................................... < 5 s
1 Hz filter................................................................. < 50 s
Frequency Measurement
Signal Amplitude Range ......................................... 5 % of range to limit set by maximum V
.
Hz
Gate Mode
Normal
Fast
Resolution......................................................... 6.5 digits
4.5 digits
Frequency Range ............................................. 10 Hz - 1 MHz
200 Hz - 1 MHz
Accuracy (1 year, 13 °C - 33 °C) ..................... ± (10 ppm of R 2 digits)
± 2 digits
Sample Interval................................................. 1 s
50 ms
Summary of Contents for 8508A
Page 6: ...8508A Service Manual iv ...
Page 8: ...8508A Service Manual vi ...
Page 10: ...8508A Service Manual viii ...
Page 12: ...8508A Service Manual 1 2 ...
Page 32: ...8508A Service Manual 1 22 ...
Page 34: ...8508A Service Manual 2 2 ...
Page 40: ...8508A Service Manual 2 8 ...
Page 84: ...8508A Service Manual 3 44 ...
Page 88: ...8508A Service Manual 4 2 ...
Page 108: ...8508A Service Manual 5 2 ...
Page 120: ...8508A Service Manual 5 14 ...