Millar MPVS Ultra, User Manual

Page: 19 / 44

M.I. P/N 004-2163 Rev. C 19
Offset Value (mmHg)
The user can manually adjust the pressure offset of each pressure channel. This is useful
when an artificial offset is introduced into a system and requires correction.
To adjust the pressure offset, unlock the balance controls and use the offset arrows to
manually adjust the offset up or down. The user can also type the desired value directly
into the
Offset Value
fields. As noted in the procedural descriptions above and in the
transducer IFUs, it is advisable to do this balance adjustment after soaking the catheter for
30 minutes. Ideally, the pressure sensor should be just below the surface of warm (body
temperature) water and shielded from ambient light. See the troubleshooting section for
tips on proper balancing techniques.
The range of the offset is − 250 mmHg to 250 mmHg.
The balance control does not affect the electronic calibration outputs (0mmHg, 25mmHg,
and 100mmHg) described below.
Auto Zero
The user can quickly auto zero each pressure channel by applying a zero reference pressure
to the catheter and then clicking
Auto Zero
under the desired channel. This sets the
applied pressure as zero.
Pressure 2 Select
The MPVS Ultra provides two amplifiers for use with a pressure transducer.
Pressure 1
is always set to the P-V input connector on the MPVS Ultra front panel. This
will typically be the pressure sensor located in the middle of the conductance electrodes.
Pressure 2 Select
allows the user to specify which input is used for the secondary
pressure channel.
Primary (P-V)
sets the second pressure input to the P-V input connector on the MPVS
Ultra front panel. This is used when the user is using a dual sensor pressure volume
catheter such as the SPR-562-1.
Secondary (P2)
sets the second pressure input to the P2 input connector on the MPVS
Ultra front panel. This is used when the user is using a separate single sensor pressure
catheter.
Pressure Monitor and Calibration
Transducer
– When the
Transducer
button is activated the system will read inputs from
the pressure sensors. The
Transducer
button must be activated to view pressure
waveforms.
0 mmHg
– When the 0 mmHg button is activated, the MPVS Ultra will output a zero volt
signal to both pressure outputs.
25 mmHg
– When the 25 mmHg button is activated, the MPVS Ultra will output a 0.25
V signal to both pressure outputs.
100 mmHg
– When the 100 mmHg button is activated, the MPVS Ultra will output a 1.0
V signal to both pressure outputs.
Detailed Operation