5730A
Operators Manual
4-32
52120A Transconductance Amplifier Output
The 52120A Amplifier boosts ac and dc current. A maximum of three 52120A amplifiers
may be connected together to the Calibrator. When their outputs are connected in
parallel, they produce two (for two 52120As) or three (for three 52120As) times the
current output, providing up to 300 A of dc current and 360 A rms ac current.
To set a boosted output with the 52120A Amplifier:
1. Install the 52120A as described in the 52120A Users Manual.
2. If the “Boost Amp Types” setting in the Setup Menu has been changed from the
default, select the 52120A for current boost as described at the beginning of this
chapter.
3. Make sure the Calibrator and 52120A are in standby (STANDBY annunciator lit).
Push if necessary.
4. If the UUT is not connected, connect it now as described earlier in this chapter under
“Connect the Calibrator to a UUT.” For boosted current, connect to the 52120A
binding posts.
5. Set the UUT to read the appropriate quantity.
6. Enter the necessary output value as described under “Set the Output.” Current entries
beyond the standard range of the Calibrator automatically select the amplifier.
7. To deactivate the amplifier, touch Boost again.
Error Mode Operation
The output adjustment controls (arrow keys and the rotary knob) are used to adjust the
output of the Calibrator incrementally (except in the resistance function). As this
happens, the Calibrator computes and shows the difference between the adjusted output
and the reference level in ±% or ±ppm (parts per million). The reference level is the
original output setting before it was adjusted. When this capability is used to adjust the
output until the UUT reads correctly, the displayed difference is the UUT error for that
output setting. The error is shown in ±% unless it is ±20 ppm or less.
For example, if the Calibrator is set to output 10.00000 V, and the UUT reads high. To
determine the error, use the output adjustment controls to adjust the Calibrator until the
UUT reads 10.0000 V. If, for example, the Calibrator display now reads 9.993900, the
Calibrator calculates and shows a UUT error of +0.0610 % on the display.
The Calibrator uses this formula to calculate the UUT error:
Error=
(Reference) - (Final Output)
X 100 %
(Reference)
The rotary knob is also a convenient way to change the frequency during ac voltage tests.
To adjust frequency in error mode, for example, when meter flatness is tested, push
. The 10 Hz digit of the frequency line is highlighted. Push twice. When the
knob is turned, the output frequency increases or decreases 1 kHz per knob click.
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