Troubleshooting
My SFT 881 Won't Feed the Proper Input Into My Third-Party Equipment
Installing a pull-up resistor ensures that the SFT 881's Pulse Output terminal is properly powered and can communicate with third-party equipment. If your equipment already has a built-in pull-up resistor, no external one is needed. Otherwise, follow the steps below to install one and ensure proper signal transmission.
Steps to Check for an Existing Pull-Up Resistor
1 Check the Manual
- Refer to your third-party equipment's manual to see if a pull-up resistor is installed in the counter.
2 Test with an Ohmmeter
- With the power off, use an ohmmeter to measure the resistance between the Pulse Input and Voltage Input terminals of the Pulse Counter.
- If the reading is between 1kΩ and 10kΩ, a pull-up resistor is installed, and no further action is needed.
- If there is no reading or a much higher resistance, you will need to install an external pull-up resistor.
How to Install an External Pull-Up Resistor
1 Choose a Resistor
- Select a 1kΩ resistor, which is suitable for most applications.
2 Connect the Resistor
- Connect one end of the resistor to the Pulse Output terminal on the SFT 881.
- Connect the other end of the resistor to the same power source supplying the pulse counter.
3 Connect Ground
- Ensure the ground of the Pulse Output terminal is connected to the ground of the Pulse Counter.
4 Power Up
- Once the connections are made, power up the system. The solid-state switch in the SFT 881 will now generate pulses that the counter can read.
