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Operation

Smoothed Mode - FD2 Only

This mode is used to obtain more stable heart rate readings. In this mode, FHR

is averaged over 8 beats. The LCD displays a solid heart symbol.

Manual Mode - FD2 Only

This mode is used when a fetal heart beat is audible in the loudspeaker or

headphones but, due to noise or a low signal level, the FD2 cannot reliably

calculate the heart rate. In this mode, the heart rate can be manually counted

over a period of 10 audible heart beats (see below). The FD2 will automatically

calculate and display the derived FHR on the LCD. The LCD displays a clock

symbol.

Mode Selection

Press the Mode button to select mode.

Use of Manual Mode (FD2 Only)

1. Press and hold Start/Stop button and immediately count the audible

heart beats, counting the ﬁ rst beat as the button is pressed. The

LCD displays the ﬂ ashing clock symbol and the FHR reading is

shown as three dashes.

2. Release the Start/Stop button immediately on the count of 10 (i.e.

After nine beat intervals). The FD2 will automatically calculate the

derived FHR averaged over the 10 beat period and display the

result. This rate value is retained until the measurement is repeated

or the unit is switched off. If the button is held for a period less than

about 3 seconds the display will clear the previous rate value and

reset.

Connection to Printa II™ (FD2 Only)

Hard copy printing is automatically selected when the plug of the interface buffer

box is inserted into the RS232 socket on the top panel of the FD2. Printing is

then initiated by using the Start/Stop button.

Huntleigh FD1 User Manual

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