Theory of Operation
Functional Description
3
3-9
The ac input voltages are divided with the same divider arrangement as the
dc input voltages, with the exception that the 2V ac voltage range is divided
by 10. The divider output signals for ac voltages are ac-coupled to the input
of a true rms ac converter which produces a current output. A negative dc
representation of the ac input signal is filtered and applied to the input of the
a/d converter.
Table 3-1. Voltage Input Divider
Function
Range
Input
Divider
Range of A/D Converter Input
DC Voltage
200 mV
2V*
20V
200V
1000V*
1/1
1/1
1/100
1/1000
1/1000
-200 mV to +200 mV
-2V to +2V
-200 mV to +200 mV
-200 mV to +200 mV
-2V to + 2V (1V max. input)
AC Voltage
200 mV
2V
20V
200V
750V*
1/1
1/10
1/100
1/1000
1/1000
0 to -200 mV
0 to -200 mV
0 to -200 mV
0 to -200 mV
0 to -2V (-0.75V max. input)
*Integrator gain in a/d converter reduced by factor of 10.
3-7. Current
Measurement
Current measurements are made using a double-fuse-protected, switchable,
five-terminal current shunt (0.1 ohm, 1 ohm, 10 ohm, 100 ohm or 1 kilohm)
to perform the current-to-voltage conversion required by the a/d converter. A
block diagram of current measurements is shown in Figure 3-5. When the dc
current function is selected, the dc voltage drop across the shunt is filtered
and applied to the input of the a/d converter. When the ac current function is
selected the ac voltage drop across the shunt is ac-coupled to the input of the
true rms ac converter. The dc representation of the ac voltage is filtered and
applied to the input of the a/d converter. All current ranges use the
±
200 mV
a/d converter input range.
Summary of Contents for 8062A
Page 4: ......
Page 8: ...8062A Instruction Manual iv...
Page 10: ...8062A Instruction Manual vi...
Page 14: ...8062A Instruction Manual 1 2...
Page 24: ...8062A Instruction Manual 2 2...
Page 50: ...8062A Instruction Manual 2 28...
Page 52: ...8062A Instruction Manual 3 2...
Page 62: ...8062A Instruction Manual 3 12...
Page 64: ...8062A Instruction Manual 4 2...
Page 90: ...8062A Instruction Manual 4 28...
Page 92: ...8062A Instruction Manual 5 2...
Page 102: ...8062A Instruction Manual 5 12 8062A 4031 iv39c eps Figure 5 2 A1 Main PCB Assembly...
Page 106: ...8062A Instruction Manual 6 2...
Page 108: ...8062A Instruction Manual 6 4 dy55c eps Figure 6 1 Accessories...
Page 118: ...8062A Instruction Manual 7 2...
Page 122: ...8062A Instruction Manual 7 6...
Page 123: ...8062A Instruction Manual 7 7 8062A 1201 iu46c eps Figure 7 5 A1 Main PCB Schmatic Diagram...
Page 124: ...8062A Instruction Manual 7 8 8060A 1003 iu61f eps Figure 7 6 A3 RMS PCB Schmatic Diagram...