Overview The ASC-400 Advanced Signal Calibrator has a built in adjustment function for readjustment of the calibrator. This adjustment function is based on a simple ASCII protocol, and you can get access to that function by the USB interface. You can use a terminal program like HyperTerminal by accessing the instrument via the USB interface, or you can develop your own dedicated adjustment program in Visual Basic, Labview, etc.
After a while the computer will ask for a driver and you have to locate the driver on the USB-stick in the subfolder utilities. When the driver is installed you will get a virtual COMPORT named AMETEK Advanced Signal Calibrator. Start up your preferred terminal program and locate this Virtual COMPORT in the terminal setup.
Once a particular adjustment menu selection has been made the user is prompted to either input a signal into the ASC-400 or enter the output value of a signal from the ASC-400. When inputting signals into the ASC-400, the readings are taken after the {enter} key is pressed and before the next prompt.
ASC-400 Adjustment procedures Adjusting Isolated current (mA) Input: 1. Connect Calibrator mA output to Digital Multimeter mA input and to ASC-400 Isolated mA measure terminals. 2. Type “1” in the Calibration menu. Prompt = “Input 0 mA to ASC400 - Press <enter> when stable”...
4. Enter multimeter read value when stable (example: 24.0000) and press “enter”. ASC-400 now returns to the Calibration menu. Adjusting Voltage input: 1. Connect Calibrator V output to Digital Multimeter V input and ASC-400 V measure terminals. 2. Type “5” in the Calibration menu.
5. Apply 400.00 ohm to the input and press “enter” when stable. Prompt = “Input 4000 ohm to ASC400 - Press <enter> when stable” 6. Apply 4000.0 ohm to the input and press “enter” when stable. ASC-400 now returns to the Calibration menu.
5.10 Adjusting Thermocouple (mV) Output: 1. Connect Digital Multimeter V input to ASC-400 mV source terminals (use TC to banana cable). 2. Type “10” in the Calibration menu. 3. Follow the menu prompts. Prompt = “First calibration point. Enter mV output:”...
3. Apply 0.95 bar absolute to the ASC-400 and press “enter” when stable. Prompt = “Apply 1.05 bar absolute - Press <enter> when stable” 4. Apply 1.05 bar absolute to the ASC-400 and press “enter” when stable. ASC- 400 now returns to the Calibration menu.
This procedure does not cover the verification of the unit. As a rule of thumb the unit should never use up more than 50% of its specifications immediately after adjustment. Also the person adjusting the ASC-400 can exit and enter calibration mode at will, while doing the verification as they go.