Ametek TR-2100 Operation Manual page 42

TR-2100 User Manual 36
Once any adjust button has been pressed, a command is sent to the TR-2100 that updates
offset values in the memory of the TR-2100. Although the TR-2100 has its local values
updated, the actual EEPROM has not been updated at this stage. The process of writing to
the EEPROM is a slow process. Therefore, the EEPROM is only updated when the user
switches to gain calibration or switches input cards.
Gain Adjustment
To start the gain calibration, click on the Gain adjustment tab. The system will first save
any changes in offset calibration – see below. A good AC or DC signal generator is
required, preferably one which generates a signal at least twice as accurate as the accuracy
of the TR-2100. Alternately, the output of the generator can be measured with a meter that
has at least twice the accuracy of the TR-2100. For AC calibration, the normal system
frequency (50.00 or 60.00 Hz) should be used.
The user requires knowledge of the type of channels (voltage or current etc.) and their Full
Scale Deflection (FSD) values. These are found in the User Specification Sheets that are
located in Appendix V of this manual, and are specific to each individual instrument. The
serial number of the instrument should be checked against the serial number on the User
Specification sheet. The instrument serial number will be found on a label attached to the
rear panel.
The channel types and FSDs can also be found by using Display Station to connect to the
recorder and viewing the analog input configuration. The TR-2100 is normally calibrated
using secondary units. As an example, for a voltage channel the full scale value is 212.132 V
rms, and for a current channel the full scale value is 1.41421 V rms. For current channels,
the TR-2100 may be calibrated using a current or voltage signal. If internal shunts are
installed, a current signal can be used and is preferred since the correction will include the