Differences

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

--- slice:dhv [2021/04/05 23:41] – [SLICE-DHV Dual-Channel High-Voltage Amplifier] Michael Radunsky
+++ slice:dhv [2024/04/09 21:54] (current) – Adding direct link to "Load Size..." app note Thomas Bersano
@@ Line 91: / Line 91: @@
 | Control Interfaces                                    |  Touch screen, USB 2.0                                                                 |
 | Output Voltage Range                                  |  0-200 V                                                                               |
-| Modulation Modes                                      |Unity Gain: ±10 V around a user-settable voltage\\ Full Range: 0-200 V  |
+| Gain Ranges                                      |Unity Gain: ±10 V around a user-settable voltage\\ Full Range: 0-200 V  |
 ^  Modulation Gains                                                                                                                             ||
-|Unity Gain Mode \\ Full Range Mode                   |  1 V/V \\ 20 V/V                                                                       |
+|Unity Gain \\ Full Range                   |  1 V/V \\ 20 V/V                                                                       |
 ^  Bandwidth                                                                                                                                    ||
 |Small Signal\\ Large Signal                          |  >1 MHz, unloaded\\ <20 Hz, C<sub>load</sub> <0.5 µF                                           |
@@ Line 99: / Line 99: @@
 | Output Current                                        |  ±200 mA                                                                                |
 | Modulation Input Voltage Range                        |  ±10 V((see note in <tabref no_neg>))                                                  |
-| Voltage Noise                                         |  <500 µV rms (10 Hz - 100 kHz)                                                          |
+| Voltage Noise                                         |  <450 µV rms (10 Hz - 100 kHz)                                                          |
 | Accuracy                                              |  <1%                                                                                   |
 | Drift                                                 |  0.2 mV/°C                                                                             |
@@ Line 226: / Line 226: @@
 <imgcaption mod_mode|Select modulation mode>{{ : slice:dhv:slice-dhv_signal_processing_mode_selection.jpg?430 |}}</imgcaption>
+====Choosing Current Limited or Full Bandwidth====
+On newer models of the SLICE-DHV, a feature was added which allows the user to switch the Modulation Mode of their unit between Current Limited, and Full Bandwidth. These two modes control the amount of drive current which can be sent through the output op-amp to modulate the load attached to HV out. In Full Bandwidth mode, the current through the op-amp is not limited, giving the SLICE-DHV a larger modulation bandwidth. The drawback, however, is that the output op-amp will occasionally go into thermal shutdown, or show distortions when driven especially hard, or with larger loads. In Current Limited mode, the output op-amp is throttled slightly to prevent the thermal shutdown and distortions seen in Full Bandwidth mode. However, using Current Limited mode slightly reduces the overall bandwidth of the system.
+It is recommended to use the Full Bandwidth modulation mode if in the small signal regime (G=1 output mode, < 20 Vpp modulation), and to switch the SLICE-DHV into its Current Limited modulation mode if larger modulations (G=20 output mode, > 20 Vpp modulation) are required. This will help to prevent thermal shutdown. Certain systems may require different settings than these, though, depending on their specifics. For a more in depth discussion of choosing between Full Bandwidth and Current Limited, see our application note [[https://vescent.com/us/amfile/file/download/file/34/product/171/|Load Size Selection and Limiting Factors of the SLICE-DHV’s Modulation Output]].
 ==== 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. \\
@@ Line 270: / Line 274: @@
 ==== Modulating the SLICE-DHV Output ====
-The user can input an analog voltage signal to control the output of the SLICE-DHV. Before introducing a modulation signal, make sure you have selected the [[slice:dhv#Setting_the_Modulation_Mode|desired modulation mode]] (Unity Gain or Full Range).  \\
+The user can input an analog voltage signal to control the output of the SLICE-DHV. Before introducing a modulation signal, make sure you have selected the [[slice:dhv#Setting_the_Modulation_Mode|desired modulation gain]].  \\
 The default modulation input port is the SMA connector on the rear panel (bubble 3, <imgref back>).  The user can also program the SLICE-DHV to accept the modulation signal from the front-panel INPUT A for Channel 1 and INPUT B for Channel 2.  Only one modulation input for a given channel can be active at any given time.  To toggle between modulation input locations touch the I/O icon on the control bar and then the relevant INPUT field (A for CH1 or B for CH 2; <imgref input_a>). Select OFF for rear-panel input or Modulation Input for front-panel input.
@@ Line 336: / Line 340: @@
 Change the input impedance of the two front-panel input ports.  Select either 50 Ω or 1 MΩ. For most applications of the SLICE-DHV, a 1 MΩ impedance should be chosen.
-=== SLICE Firmware ===
-From time to time, Vescent will upgrade the firmware for controlling the SLICE-DCC.  The procedure to [[https://github.com/Vescent|upgrade the SLICE-DHV firmware]] is given here.
@@ Line 355: / Line 357: @@
 It is possible to control the SLICE-DHV through serial commands.  Click here to access the [[slice:dhv:API|SLICE-DHV API]].
-Please contact [[[email protected]|sales [at] vescent [dot] com]] for information.
+<WRAP round important 100%>
+Upgrading the SLICE-DHV firmware is not always necessary to use the Serial API. Check your installed firmware version in the settings menu against the most recent firmware version given [[https://github.com/Vescent/SLICE-DHV-Firmware-Upgrade|here]].
+</WRAP>
+Please contact [[[email protected]|sales [at] vescent [dot] com]] for information.
 ===== Maintenance =====
 There are no user-serviceable parts inside this instrument. Refer all repairs to the manufacturer.  Work performed by persons not authorized by Vescent Photonics may void the warranty.