Fluke 1738 Calibration Manual - Page 28

Basic Instrument Setup for all Verifications, no voltage transformers used

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1736/1738 Calibration Manual Table 9. Calibration and Verification in Excel Worksheet (cont.) Item Description Sensor selector - select items from the list for a verification of the accessory.  Use DIRECT for the Fluke Logger verification.  Calibration items - Select Voltage, AUX Input or Current input for calibration. For a Logger calibration all three items need to be calibrated sequentially. A specific order is not required. Calibrator Control setup - When the calibrator is connected to the PC using a RS232 cable select  Automatic to control the calibrator. Use the drop-down list box to configure the COM port. Otherwise select Manual.  Voltage Divider setup - Configure the resistor values, R1 and R2, of the voltage divider for current verification. Store the Excel workbook to keep the applied values for future use. Supported Calibrators: Fluke 5520A and 5522A Calibrator settings: Baud rate: 9600 Data bits: 8 Stop bit:1 Parity:None Stall: XON/XOFF EOL:CR/LF Basic Instrument Setup for all Verifications The Fluke173x-ExcelTool_Vxxx (ExcelTool) has built-in procedures to verify and adjust the Logger. The Verification uses an external divider. This divider, (see Verification Box Assembly) provides more accurate voltages than a direct connection to the 5520A. The 5520A uses a divider with a 50 Ω output impedance when sourcing

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1736/1738
Calibration Manual
22
Basic Instrument Setup for all Verifications
The
Fluke173x-ExcelTool_Vxxx
(ExcelTool) has built-in procedures to verify and adjust the Logger. The
Verification uses an external divider. This divider, (see
Verification Box Assembly
) provides more accurate
voltages than a direct connection to the 5520A. The 5520A uses a divider with a 50
Ω
output impedance
when sourcing <330 mV. Due to variations in the Logger input impedance, the actual applied voltage is less
than the programmed voltage. Using an external divider where the parallel resistance is ~30
Ω
allows
calculation of the applied voltage with confidence that the Logger input loading will not significantly impact
the applied voltage.
The ExcelTool calculates the voltage that should be applied based on the values entered in the setup
screen.
1.
Apply power to the Logger using the power supply and line cord.
2.
Turn on the Logger
.
3.
Connect the Logger USB to the PC and start a communication program. See
USB Communication
.
4.
Select Measurement Setup as
no voltage transformers used
.
Sensor selector – select items from the list for a verification of the accessory.
Use DIRECT for the Fluke Logger verification.
Calibration items – Select Voltage, AUX Input or Current input for calibration. For a Logger calibration all
three items need to be calibrated sequentially. A specific order is not required.
Calibrator Control setup – When the calibrator is connected to the PC using a RS232 cable select
Automatic
to control the calibrator. Use the drop-down list box to configure the COM port. Otherwise select
Manual
.
Voltage Divider setup – Configure the resistor values, R1 and R2, of the voltage divider for current
verification. Store the Excel workbook to keep the applied values for future use.
Supported Calibrators:
Fluke 5520A and 5522A
Calibrator settings:
Baud rate: 9600
Data bits: 8
Stop bit:1
Parity:None
Stall:
XON/XOFF
EOL:CR/LF
Table 9. Calibration and Verification in Excel Worksheet
(cont.)
Item
Description