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5700A/5720A Series II Calibrator
Service Manual
2-12
2-12. Wideband AC V Functional Description (Option -03)
The Wideband AC Voltage module (Option -03) consists of the Wideband Oscillator
assembly (A6) and the Wideband Output assembly (A5). There are two wideband
frequency ranges:
• 10 Hz to 1.1 MHz
• 1.2 MHz to 30 MHz
During operation between 10 Hz and 1.1 MHz, output from the Oscillator Output
assembly is routed to the Wideband Output assembly where it is amplified and
attenuated to achieve the specified amplitude range. The output is connected to the
Calibrator front panel WIDEBAND connector. Operation between 1.2 MHz and 30 MHz
works the same way, except the input to the Wideband Output assembly is the ac signal
from the Wideband Oscillator assembly.
2-13. DC Current Functional Description
DC current is generated in five ranges:
• 20 µA - 220 µA
• 220 µA - 2.2 mA
• 2.2 mA - 22 mA
• 22 mA - 220 mA
• 2.2A
All current ranges except 2.2A are generated by the current portion of the Current/Hi-
Res assembly. These currents are created by connecting the output of the DAC assembly,
set to the 22V range, to the input of the Current assembly. The Current assembly uses
this dc voltage to create the output current. The current output can be connected to the
AUX CURRENT OUTPUT binding post by relays on the Current assembly, to the
OUTPUT HI binding post by relays on the Current, Switch Matrix, and Analog
Motherboard assemblies, or to the 5725A via the B-CUR line by relays on the Analog
Motherboard assembly and Rear Panel assembly.
The 2.2A range is an extension of the 22 mA range. The 22 mA range output from the
Current assembly is amplified by a gain of 100 by the High Voltage/High Current
assembly operating in conjunction with the Power Amp assembly and the High Voltage
Control assembly. The 2.2A current range is routed back to the Current assembly where
it is connected to either the AUX CURRENT OUTPUT binding post, the OUTPUT HI
binding post, or the 5725A in the same manner as the lower current ranges.
2-14. AC Current Functional Description
AC current is created in the same manner as dc current, except the input to the Current
assembly is the ac voltage from the Oscillator Output assembly set to the 22V range. The
switching between ac and dc is carried out on the Switch Matrix, Oscillator Control,
Oscillator Output, and DAC assemblies.