ADLINK PCI-9114 (A) Data Acquisition Card Selection and Configuration Guide

Calibration and maintenance

To ensure measurement accuracy, PCI-9114 (A) requires regular calibration. Five variable resistors (VR1~VR5) on board correspond to different adjustment items:

Number function

VR1 A/D offset adjustment (later stage)

VR2 A/D full-scale adjustment

VR3 Programmable Gain Amplifier Input Offset Adjustment

VR4 Cold End Sensor Offset Adjustment

VR5 PGA output offset adjustment (PCI-9114A/Rev.C2 only)

Key points of calibration process:

PGA offset calibration: Ground AD channel # 16, set maximum gain (HG to 1000, DG to 8), adjust VR3 to make TP1-TP2 voltage approach 0; Set the minimum gain again and adjust VR5 to approach 0. Repeatedly multiple times.

A/D offset calibration: Channel # 16 is grounded, gain=1, adjust VR1 to make the read value between -1~+1.

Full range calibration: Connect an accurate+10V reference voltage, gain=1, adjust VR2 to make the reading between 32766 and 32767.

Cold end calibration: Measure the ambient temperature and adjust VR4 to make the reading conform to the relationship of V (mV)=T (K) × 10.

Calibration cycle recommendation: Once every 3 months for frequent temperature changes or vibration environments; Once every 6-12 months in the laboratory environment.

Common troubleshooting

The A/D reading is always 0 or at full range: check if the input signal is within range, if the JP1 jumper is set correctly, and if the reference voltage is stable.

FIFO overflow error: Sampling rate too high or software polling not timely. Switch to FIFO half full interrupt mode or reduce the sampling rate.

Interrupt does not trigger: confirm that _9114_INT_Source_Control has enabled the corresponding interrupt source, and call the clear function in ISR; Check if PCI IRQ conflicts with other devices.

Pre trigger no response: Confirm that PTRG bit has been set to 1, Counter # 0 has loaded the initial value, and whether the external PreTrg signal level is correct (falling edge trigger).

Isolation output without driver: Check if Vpower is connected and if EOGND is grounded with the load; Is the inductive load connected to a current diode.