Differences

This shows you the differences between two versions of the page.

--- slice:dhv [2020/05/25 21:39] – [Using the Host GUI] Kurt Vogel
+++ slice:dhv [2021/04/05 23:26] – [Setting the Modulation Mode] Michael Radunsky
@@ Line 217: / Line 217: @@
 ==== Bar Graph and Output Voltage Indicator ====
 The blue bar graph and output voltage indicator (bubbles 11 & 4 in <imgref front>) report the high voltage output. This display is intended to display the "DC" value of the output with an update rate of about 4 Hz and will not capture faster transient behavior of the output. These displays offer quick visual identification of the output voltage and can help visualize drift in feedback control applications.
-==== Setting the Modulation Mode ====
+==== Setting the Gain on the Input Signal ====
-The SLICE-DHV has two modulation modes: a Unity Gain mode and a Full Range mode. In Unity Gain mode the input modulation signal is directly summed with the DC Bias to produce the high voltage output. This mode is useful for limiting the voltage range of the high voltage output to ±10 V around the DC Bias operating voltage. The Unity Gain mode will also exhibit less noise than the Full Range mode, dependent on the noise level of the modulation input signal. \\
+The Gain on the input control signal can be set to either 1 or 20.  When the gain is 1, the input modulation signal is directly summed with the DC Bias to produce the high voltage output.  This mode is useful for limiting the voltage range of the high voltage output to ±10 V around the DC bias operating voltage. \\
-In Full Range mode the input modulation signal experiences a gain of 20. In this mode the DC Bias defaults to zero voltage but can be adjusted to add a DC Bias to the modulation signal if desired. This mode allows the modulation input to drive the high voltage output over the entire 0 to 200 V range of the SLICE-DHV. Note that the large-signal bandwidth will be limited in this mode to less than 20 Hz, but that the small-signal bandwidth (±10V) will be identical to that of the Unity Gain mode. \\
+When the Gain is set to 20, the input signal is multiplied by 20 and then summed into the DC bias.  This mode allows the modulation input to drive the high voltage output over the entire 0 to 200 V range of the SLICE-DHV.  In this mode the DC Bias defaults to zero voltage but can be adjusted to add a DC Bias to the modulation signal if desired.   Note that the large-signal bandwidth will be limited when the Gain is set to 20 to less than 20 Hz, but that the small-signal bandwidth (±10V) will be identical to that when Gain = 1. \\
-To change the modulation mode, touch the CH 1 (or CH 2) field at the top of the channel column.  You will be presented with <imgref CH_settings>.  Touch the Modulation Mode field to drill down to <imgref mod_mode> and select either G=1 V/V; Range = ±10 V (Unity Gain mode) or G=20 V/V; Range = 0-200 V (Full Range mode).
+To change the Gain, touch the CH 1 (or CH 2) field at the top of the channel column.  You will be presented with <imgref CH_settings>.  Touch the Modulation Mode field to drill down to <imgref mod_mode> and select either G=1 V/V; Range = ±10 V or G=20 V/V; Range = 0-200.
 <imgcaption CH_settings|Setting parameters of individual channel>{{ : slice:dhv:slice-dhv_ch_settings_changed.jpg?430 |}}</imgcaption>
 <imgcaption mod_mode|Select modulation mode>{{ : slice:dhv:slice-dhv_signal_processing_mode_selection.jpg?430 |}}</imgcaption>
 ==== Setting the Voltage Limit ====
 The user can set the maximum voltage output on a given channel so as not to exceed the rated maximum for their device.  From the Home screen, touch the CH 1 (or CH 2) field to see <imgref CH_settings>.  Touch the Voltage Limit [V] field to set the maximum voltage output. The bar graph output indicator on the Home screen will scale automatically with the maximum voltage set point. \\
+|  <WRAP important></WRAP>  |This voltage limit circuit in the DHV hardware limits the voltage (including the modulation input) to the user defined limit when using the G=20 V/V mode.  However, this hardware limit does not cap the modulation input in the G=1 V/V.  Therefore, when operating in the G=1 V/V mode, if the user were to set the nominal voltage set point to the user-defined maximum voltage output point, the output with a +10 V modulation input would exceed the user-defined limit by 10 V |
 ==== Setting the Bias Voltage ====
 To set the bias voltage about which the SLICE-DHV will operate on a given channel, touch the DC Bias [V] field on the Home screen.  Depending on the length of the touch, either a view similar to <imgref Vset_knob> allowing rotary knob input or a keypad similar to <imgref keypad> will be displayed.  Set the nominal bias voltage. \\