Ideally you check the functions using the manufacturers recommended procedures.
In the absence of this and with limited equipment the following can be used for verification purposes.

IBP leads usually consist of 4 connections, a positive and a negative pressure signal input, and to the monitor (+/-)
a positive and a negative excitation voltage output from the Propaq monitor.
The IBP module supplies a differential excitation voltage to the pressure transducer that connects to the IBP lead.
The monitor provides this excitation voltage to the pressure transducer

The pressure transducer usually gives a differential output voltage from the bridge of 5uV/V/mmHg or 40uV/V/mmhg
i.e. 5/40uV per volt excitation per mmHg pressure applied to the transducer.

Once you know the IBP pin outs, it is relatively easy to simulate static pressures in older monitor types. (Newer monitors
will not give you a reading unless it senses an attached transducer. Build a bridge with 1k resistors in the legs
and an extra 100R in the fourth leg with a short out switch across it).

So check of IBP consists of a Cal mode static pressure zero mmHg and a span (say 300 mmHg)

So with 5uV sensitivity, and an excitation voltage of 10.000 volt, (you use a dc calibrator, or dc power supplies and a multimeter
with suitable resolution) you can provide and provide a simulated pressure signal of
1.5 mv across the positive and negative pressure signal inputs this should simulate a static pressure of 300 mmHg.

0.000005 X 10 X 300 = 0.0015 Volts (1.5 mV)

Like wise with a 40uV sensitivity

0.000040 X 10 X 300 = 0.0120 Volts (12.0 mV)

Alternatively if you have an IBP transducer, check zero and span with a manometer.


EtCo2, ideally you need a sample line, calibration gas (nominal 5% CO2) and a regulator and follow the cal procedure.
A quick verification can be performed by sampling exhaled breath after a few exhalations into the sample line.
Check the monitor EtCo2 waveform is detecting Co2 and check numeric readings.

Many years ago, when we didn’t have all the flash test equipment we had to make do with what was available.

Happy Days....