Battery Charger; Cautery Suppressor; Optional Headphones - Parks 915-BL Operating & Service Manual

Equipment Description

Battery Charger

The Doppler comes with a 24VDC 0.63 A battery charger; the charger plugs into the front of the
Doppler and must be connected to an AC power supply (appropriate wall plug adapter must be used for
outlets other than 120 V). The Doppler battery cannot be overcharged. The Doppler cannot be operated
while it is connected to the battery charger.
Battery Life
Battery life between charges for a new battery will be more than 16 hours on a full charge. The battery
life will decrease as the battery ages or if it is not kept fully charged.
With normal service and care, a battery can be expected to last two to three years. Leaving the battery
discharged for days will shorten the life of the battery.

Cautery Suppressor

Under normal operating conditions, the cautery suppressor is off.
Use of the Doppler in the presence of a cautery can cause interference. A cautery generates sound over
a wide band of frequencies that cannot be fi ltered by the Doppler. The frequencies close to the probe
frequency will be picked up by the probe wires and transmitted to the Doppler speaker. Experimenting
with placement of the probe cable and the Doppler can minimize cautery interference, but not eliminate
it. The cautery suppressor is designed to shut off sound to the Doppler speaker or headphones when the
volume of the cautery interference exceeds that of the blood fl ow or air emboli detected by the probe.
The control knob for the cautery suppressor is on the front panel of the Doppler. The cautery suppressor
is off when the cautery suppressor control knob is turned all the way counterclockwise. Turning the knob
clockwise increases the level of suppression.
Headphones
The speaker is disconnected when the optional low impedance stereo headphones are plugged in. You will
always hear more through the headphones, especially when checking weak fl ow or veins.
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915-BL Dual Frequency Doppler